Underreamer and expansion-bit.



No. 674,793. Patented May 2|, |90I. E. NUBTH.

UNDERREAMEB AND EXPANSIUN BIT.

v (Application led Nov. 2, 1900.) (No ModeL) I lllllllllll\ f D r.

EDWARD NORTH, OF LOS ANGELES, CALIFORNIA.

UNDERREAMER AND EXPANSION-B|T.

SPECIFICATION' forming part of Letters Patent No. 674,793, dated May 2.1, 1901.

Application iled November 2, 1900. Serial No. 35,281. (No model.)

To @ZZ wwm/ t may concern:

Beit known that I, EDWARD NORTH, a citi- Zen of the United States, residing at Los An geles, in the county of Los Angeles and State ot California, have invented a new and useful Underreamer and Expansion-Bit, of which the following is a specification.

The objects of my invention are extreme simplicity, cheapness of construction, great strength, freedom from getting out of order, positive action, positive locking in collapsed position while passing through the casing,and ready unlocking and expansion upon issuing below the casing.

The accompanying drawings illustrate my invention.

Figure I is an axial section of my newlyinvented underreamer and expansion-bit as the same appears in passing through the casing. Lines I I in Figs. III, IV, and V indicate the line of section. Fig. II is a like section on line II II, Fig. VI, showing the tool in operation beneath the casing. Dotted lines indicate the position of the parts of the latch just after passing through the casing. Fig. III is a plan section on line III III, Fig. I. Fig. IV is a plan section on line IV IV, Fig. I. Fig. V is a plan section on line V V, Fig. I. Fig. VI is a plan section on line VI VI, Fig. II.

@indicates a hollow body memberfurnished in its lower end with an upwardly-tapering socket b.

c indicates a jaw or bit carrying rod sliding through such socket and extending up in the body.

d cl indicate two jaws pivoted to said rodand respectively furnished at their upper ends with the shanks e e extending above the pivot 4o f,which is preferably a cross-head at the lower end of the rod c. The shanks enter the conical socket h, and when fully inserted therein tit the socket snugly to hold the jaw expanded, as indicated in'Fig. II, and may be withdrawn sufficiently therefrom to allow the tool to be collapsed, as indicated in Fig. I.

g indicates a spring to normally hold the rod c withdrawn into the body or barrel a of the tool, thus to hold the shanks e e of the jaws positively seated in the tapering socket b and the jaws consequently expanded, as shown in Fig. II.

h indicates a nut screwed onto the inner end of the rod c to form a projection, against which the spring g presses to hold the rod in normal position with the jaws expanded.

indicates an internal shoulder in the body a to sustain the lower end of the spring g.

h' indicates a boss on the nut 7?, to receive a wrench, by which said nut may be turned to screw it onto or ott of the rod c, the inner or upper end of which is screw-threaded to receive it.

j indicates a latch-carrier pivoted to the body d by a pivot la and furnished with an inwardlyextending arm l, acted upon by a spring m to normally hold the other arm 2 extended aslant outwardly and downwardly, as indicated in dotted lines in Fig. II, and to allow it to be pressed in by the casing, as shown in Fig. I. The latch-carrier arm 2 is furnished with a rounded boss 3 at its lower end to engage the casing and to be thereby pressed in when the tool is passing through the casing.

n indicates a latch pivoted in a recess 4 in the latch-carrierjj 0 indicates a spring in a recess 5 in the latch-carrier to hold the latch 'n normally impressed.

p indicates t-he pivot of the latch, by which it is pivoted in the recess 4in the latch-carrier.

The spring o normally holds the latch in position, with its inner face aslant inward and downward, so that the nut 7i will readily pass down past the latch n, and so that after the nut h has passed the latch it will project inward above the nut h to prevent it from being thrownl up by the spring g. The pivot p of the latchn is located above a stop q, formed by thel inner wall ot the recess 4, in which the latch n is pivoted, and the spring o is located below the stop, so that the stop prevents the latch from heilig thrown too far in by the spring 0.

o" indicates the barrel-carrying tool shank or stock, furnished with a screw-threaded pin s, which screws into the top of the barrel or body d. The spring m is seated in a socket, in the lower end of the pin. The cross-head fis seated in perforations or holes u u in the IOO y or body and around the rod c.

shanks e e', respectively, and the holes are of sufficient size to allow the jaws to drop down into their collapsed position whenever the rod c is forced down into position to allow the Shanks to spread apart in the socket.

QJ indicates a shoulder in the barrel or body a, which forms a stop for the nut h, thereby aifording positive means to prevent the rod c from being drawn too far down. The rod c is angular in cross-Section throughout the lower portion of its body and passes through an angular way w in the barrel or body a and which forms the termination of the tapering4 socket and is thereby prevented from turning. To afford more perfectly secure means to prevent the jaws from turning relative to the barrel when the tool is at work, sockets .as m are provided at the lower end of the body, being lateral extensions of the opposite sides of the conical seat b, and the cross-head f extends laterally beyond the Shanks e e to` t into said sockets fr when the rod is retracted to hold the Shanks e e' seated in the tapering socket.

In practical use the tool is assembled by inserting the angular rod c through the tapering socket and through the angular hole uf and bringing it into position, with the crosshead sufficiently extended to allow the Shanks e e to be mounted thereon with the opposite arins of the cross-head inserted in the holes u u', respectively. Then the rod will be further inserted and the shanks fully seated in the tapering socket b. Then the spring g will be placed in the other end of the barrel Then the nut h will be screwed into position to prevent the rod from withdrawing sufficiently to allow the Shanks to be fully withdrawn from the socket, but allowing the shanks tobe withdrawn sufciently to collapse the tool, as shown in Fig. I. Then the carrier j, with its latch n in position, as Shown, will be placed in the openings fy, provided therefor in the side of the" barrel or body and will be fastened by the pivot k. Then the spring m will be seated in its socket t in the stock or'shank r of the tool, and said shank or stock will be screwed into the upper end of the barrel or body ct,

so that the spring m acts upon the upper the latch fn, which will then be thrown in-l ward by spring o to project above the nut 71 thus to hold the rod c from being retracted by the spring g. The walls of the seat y for the latch-carrierj prevent the lower end ofI such carrier from being thrown too far out v4by the action of the spring fm, when the rod is' thus extended from the tool. Sufficient space is provided to allow the'latchn to swing outward far enough to allow the nut to pass readily down; but the spring 0 holds the latch in to prevent the return of the nut.

The operator in order to allow the tool to descend through the casing will draw the jaws out, as Shown in Fig. I, and will then allow the tool to pass down through the casing. The latch n will be held in by the lower end of thecarrier and by the spring o until the boss 3 passes below the casing, whereupon the spring m will throw the carrier out sniiciently to withdraw the latch n from above the nut h, thus allowing the rod-carrying spring g to retract the rod and bring the jaws and their Shanks into the position shown in solid linesin Fig. II. Dotted lines in Fig. II indicatethe position the latch and latch-carrier will assume immediately after the boss 3 has escaped from the casing. After the nut is thus released the spring g will throw the rod up, and the same will engage the arm l and will bring the carrierback into the position shown in solid lines in Fig. III.

When it is desired to withdraw the tool through the casing, it will be drawn upward and the upper rounding faces or shoulders 6 6 of the jaws d d will engage the lower end of the casing, and thereby as the tool passes through the casing the jaws will be drawn down into and will be held in the position shown in Fig. I, thus allowing the too'l to be withdrawn from the casing.

The Shanks e c are channeled by longitudinal channels 7 '7' to snugly chamber the rod c, so that when the'shanks are fully seated in the tapering socket b the parts at the lower end of the tool will t together, so as to form a practically solid body.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. An underreamer or expansion-bit comprising a hollow body memberfurnished in its lower end with an upwardly-tapering socket; a rod Sliding through such Socket and extending up in the body; two jaws pivoted tosaid rod and respectively furnished at their upper ends with a Shank extending above the pivot to enter the tapering socket, thereby tohold the jaws expanded; and resilient means for normally retractin g the shank to hold the jawshanks in the socket.

2. An underreamer or expansion-bit comprising a hollow body member furnished in its lower end with an upwardly-tapering socket; a rod sliding through such socket and extending up into the body; two jaws pivoted to said rod and respectively furnished at their upper ends with a shank extending above the pivot to enter the tapering socket, thereby to hold the'jaws expanded; means tomprevent the rod from turning in said body; and resilient means for normally holding the shank up to hold the jaw-Shanks in the socket.

3. An underreamer or expansion-bit comprising a hollow body memberfurnished inits lower end with an upwardly-tapering Socket IOO IIO

a rod sliding through such socket and extending up in the body; two jaws pivoted to said rod and respectively furnished at their npper ends with shanks extending above the pivot to enter the conical socket and hold the jaws expanded; resilient means for normally holding the shank up to hold the jaw-Shanks in the socket; and positive means to prevent the jaw-Shanks from being wholly withdrawn from the socket.

4. An underreamer or expansion-bit comprising a hollow bodj7 member furnished in its lower end with a tapering socket, the upper end of which socket terminates in an angular way; a rod tted in said way and sliding through said socket and way and extending up in the body; two jaws pivoted to said rod and respectively furnished at their upper ends with shanks extending above the pivot to enter the conical socket to hold the jaws expanded; and resilient means for normally holding the shank up to hold the jaw-Shanks in the socket.

5. An underreamer or expansion-bit comprising a hollow body member furnished in its lower end with a tapering socket; a rod sliding through such socket and extending up in the body; two jaws pivoted to said rod and respectively furnished at their upper ends with shanks extending above the pivot to enter the conical socket to hold the jaws expanded; resilient means for normally holding the rod up to hold the jaw-Shanks in the socket; means to prevent the complete withdrawal ofthe shanks from the socket; a latchcarrier furnished with a bearing to engage the casing to hold a latch in operative position to lock the rod down while the bearing is in contact with the casing; a latch carried by said carrier; and a spring to throw said latch-carrier to release the rod when the bearing is released from the casing.

6. An underreamer or expansion-bit comprising ahollow body member furnished in its lower end with a tapering socket; a rod sliding through such socket and extending up in the body and furnished at its lower end with a cross-head; two jaws pivotally carried by said cross-head and respectively furnished at their upperends with shanks extending above the cross-head to enter the conical socket to hold the jaws expanded; seats on the opposite sides of the socket to receive the ends of the cross-head; and resilient means for holding the rod up with the cross-head in its seats.

7. The combination of the jaws of the jawcarrying rod; the body in which said rod plays; resilient means for retracting the rod in the body; a latch-carrier pivoted to the body and furnished with a bearing to engage the well-casing; a latch pivoted to the latchcarrier; a spring for yieldinglj1 holding such latch inward; and a spring for yieldingly holding the carrier outward.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, at Los Angeles, California, this 24th day of October, 1900.

EDVARD NORTH.

Witnesses:

JAMES R. TowNsEND, J ULIA TowNsEND. 

